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2002 Vol. 28, No. 5

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Convergent Infinite Computation and Applications
LI Wei, MA Shi-long, SUI Yue-fei, XU Ke
2002, 28(5): 481-489.
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Abstract:
Classical computations can not capture the essence of infinite computations very well. This paper will focus on a class of infinite computations called convergent infinite computations and establish a logical framework for describing and analyzing how an infinite computation interacts and evolves in...
Current Status and Development Direction of Aircraft Power Technology in the World
LIU Da-xiang, CHENG Rong-hui
2002, 28(5): 490-496.
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Abstract:
The development course of jet engine is described. The engine which thrust weight ratio is about 8 is the power of the main fighters on active service in the developed countries. The 4th generation fighters stalling the jet engine with thrust weight ratio 10 will be gradually equipped with the army ...
Failure Analysis Diagnosis of Mechanical Equipment
ZHONG Qun-peng, ZHANG Zheng, TIAN Yong-jiang
2002, 28(5): 497-502.
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Abstract:
The present and development in recent decade in both practical and academic aspects of failure analysis diagnosis, prediction and prevention for mechanical and electrical equipment in China was described and summarized briefly. The category, criterion and method of pattern diagnosis were discussed. ...
Newly Developed Human, Machine and Environment Engineering Technology Science
WANG Jun, YU Jian-zu, ZHUANG Da-min, LIN Gui-ping
2002, 28(5): 503-511.
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Abstract:
Based on the human, machine and environment engineering system, filght vehicle environmental control and life insurance system, environment simulation technology, air conditioning, recent research of science of human, machine and environment engineering was described in detail, including computer si...
Comments on Multisensor Image Fusion Techniques
MAO Shi-yi, ZHAO Wei
2002, 28(5): 512-518.
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Abstract:
Multisensor image fusion is included in multisensor information fusion and has been applied widely. The techniques of image fusion are different from general information fusion techniques because of the particularity of images.The development condition about the multisensor image fusion is introduce...
Transgranular Shear Fraefure of High Strength Aluminum Alloys
CHEN Chang-qi
2002, 28(5): 519-523.
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In order to reveal the conditions for shear failure of high strength aluminum alloys, experimental tests and theoretical analysis were performed on various aluminum alloys and single crystals. It is concluded that plane strain deformation mode (external or internal) and very low strain hardening rat...
Dynamic Response Analysis of Direction Control for SemiDifferential CoAxial Helicopter
CHEN Ming, HU Ji-zhong, CAO Yi-hua
2002, 28(5): 524-527.
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The dynamic equation of a semi-differential co-axial helicopter in vertical flight was set up and solved based on classical vortex theory and character of aerodynamic interference between upper and lower rotors of the co-axial helicopter. There exists a coupling relationship between vertical movemen...
Numerical Simulation for Steady Flow Field of CounterRotating Axial Fan
LI Qiu-shi, LU Ya-jun, LI Ling
2002, 28(5): 528-531.
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To enhance the stability and accurate when calculated the complicated turbomachinery rows, an inlet/outlet condition as called general boundary condition and an advanced strongly implicit iterative method named MSIP were presented. Based on rotational arbitrarily curved coordinate and RNG improved k...
Studies on Scene Matching Algorithm of Fuzzy Similarity Metric
HUANG Xi-shan, CHEN Zhe
2002, 28(5): 532-535.
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Abstract:
Calculations of fuzzy image feature field were studied, the scene matching algorithm adopting similarity metrics of image fuzzy sets was proposed, and the matching methods of combining multiple similarity metrics of fuzzy sets were explored. Further more, the scene-matching algorithm of the fuzzy sy...
Target Recognition Method by Combination of Neural Networks with Evidence Theory
WANG Mao-lu, LI Shao-hong, MAO Shi-yi
2002, 28(5): 536-539.
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A method based on the combination of neural networks with D-S evidence theory was proposed to recognize HRR targets. Multiple HRR images were input into Learning Vector Qualification (LVQ) neural network to estimate target type evidence, the results were fused by D-S evidence theory. Methods for fea...
Morphology and Formation Mechanism of Primary TiB2 in TiAlB Alloys
ZHANG Hu, GAO Wen-li, ZHANG Er-lin, ZENG Song-yan
2002, 28(5): 540-542.
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Abstract:
Microstructure and phase constitution of Ti-53Al-xBalloys produced by an in-situ growing method were investigated by X-ray diffraction and scanning electron microscope respectively. The results show that these alloys are composed of TiAl and TiB2 phase, while the primary hexagonal prism TiB2 exhibit...
Effect of Apex Flap Length on Leading Edge Vortex Breakdown over Delta Wings
XU Yan, WANG Jin-jun
2002, 28(5): 543-546.
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Abstract:
The effectiveness of the apex flaps to control the vortex breakdown on a 70° sweep angle delta wings was studied experimentally. The angle of attack was in a range of 30°~50°. The flap angles and its length were found to be two important factors in determining the position of vortex breakdown in ste...
Structure Characteristics of PhosphorusDoped Hydrogenated NanoCrystalline Silicon Films
YU Xiao-mei, WANG Jin-liang, JIANG Xing-liu, WANG Tian-min
2002, 28(5): 547-549.
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By Raman spectroscopy, high-resolution electron microscope and atomic force microscope, the structure of phosphorus-doped hydrogenated nano-crystalline silicon films (nc-Si (P)∶H) was analyzed The films possess orderly arranged cluster feature in the size of 15~20nm. The films are composed of nano-c...
New Fault Detection Structure and Algorithm Based on Federated Filter
LIU Zhun, CHEN Zhe
2002, 28(5): 550-554.
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Based on federated Kalman filter, a new fault detection structure and algorithm was presented. The structure performs fault detection with the common states of local filters and reference filter. Chi-square test and Elman neural network test algorithm were presented. As an application, comparisons f...
Research of Load Coaxiality Testing Technology
Lü Xiao-dong, LI Xin-jun, WANG Jing-tao
2002, 28(5): 555-558.
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Abstract:
An automated method for measuring load-coaxiality of universal testing machine was presented in two aspects: basic hypothesis, math modeling for calculating and processing. Based on the principle the modeling concept was proposed. From the models posed, a measuring system using computer-testing tech...
Measurements of Velocity Uniformity in Watertunnel Using DPIV
HUANG Zhan, SHEN Gong-xin, WEI Run-jie, GUO Hui
2002, 28(5): 559-562.
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Abstract:
A Digital Particle Image Velocimetry(DPIV)system using a special Pre-bias method was applied to flow field calibration measurements in the testing section of a water tunnel. Compared with the measurement results obtained by traditional methods (Pitot probe, LDV and traditional DPIV),the results show...
Numerical Prediction of Strength for 3D Braided Composites
LU Zi-xing, LIU Zhen-guo, MAI Han-chao, CHEN Zuo-ron
2002, 28(5): 563-565.
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Abstract:
Based on experimental investigation and finite element analysis (FEA) of braided composites, an empirical failure criterion of strength was proposed to meet the need of engineering application. A strength prediction method of 3D braided composites was introduced by using the model of modulus predict...
Finite Element Analysis on Dynamic Properties of Spot Welding Robot
ZHOU Zheng-gan, LI Ran, YUN Chao
2002, 28(5): 566-569.
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To optimize structure design of spot welding robot, model analysis was performed on SIA-120 spot welding robot with ANSYS software by finite element method. Using the results of the model analysis, a proposed model was simulated and proven to be accurate by the simulation outcome. The imperfection o...
Loading Spectra Development for Special Structural Members of Fighter
LIU Xiao-dong, LIU Wen-ting, WANG Zheng
2002, 28(5): 570-573.
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Abstract:
The approach and specialties of loading spectra development using maneuvers simulation technique for new-design aircraft were introduced in brief. Onthe above basis, the approach and key-points of developing stress/pressure spectrum for integral tank, gusts and sideslip spectrum for vertical tail we...
Feed Network Design of Shaped Beam Slotted Array by Finite Element Method
WANG Jie, Lü Shan-wei
2002, 28(5): 574-577.
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Changing the angles of the centered-inclined slots was used to design the array feed's amplitude distribution. Changing the widths and lengths of the waveguides was used to design the array feed's phase distribution. A new design method of the feed network of shaped beam slotted array by finite elem...
Investigation on Start Behavior of HydroViscous Transmission
ZHANG Yi-du, ZHANG Qi-xian
2002, 28(5): 578-580.
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Abstract:
Structure of the newly developed hydro-viscous soft start transmission is introduced and the hydroviscous-braking model is presented. The study on the hydro-viscous brake shows that a coupling relationship exists among the parameters of oil film thickness, hydro-viscous torque and friction disc spee...
Sneak Circuit Analysis Algorithm Research for Analog Switch Circuit
MA Qi-shuang, TANG Yao, ZHANG Ping-bo
2002, 28(5): 581-584.
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Compared several path search methodology of sneak circuit analysis, an algorithm of sneak circuit analysis for analog switch circuit was presented. The algorithm was applied successfully to the identification and searching of topology pattern of "H" pattern, Multi-Power pattern, Multi-Ground pattern...
Experimental Study on Flow Construction over Spur Dikes
ZHANG Bai-shan, Lü Zhi-yong, ZHU Li-guo
2002, 28(5): 585-588.
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To understand effect of number and incidence of spur-dikes on flow pattern, flow construction over spur-dikes was studied by flow visualization and light sheet technique in a water channel. There are horse-shoe vortex around spur-dikes and Karman vortices behind spur-dikes. Depending on Reynolds num...
Hierarchy Requirements and Verification for Cryptographic Protocols
LIU Yi-wen, LI Wei-qin
2002, 28(5): 589-592.
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Abstract:
The security requirements for cryptographic protocols were divided into shallow requirements and deep requirements. The hierarchy security requirements were illustrated. Using temporal logic and algebra, a formal requirement language was presented and used to describe the formal hierarchy requiremen...
Overbooking Risk of Civil Aviation Transportation
JU Yan-bing, FENG Yun-cheng, WANG Ai-hua
2002, 28(5): 593-596.
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Abstract:
Based on the experiences of managing risks of civil aviation companies, a Value at Risk (VaR) procedure was proposed to control overbooking risk．The calculation method of extra number of single-line and the representation of VaR of multi-line were given respectively． One whole company's VaR in a day...
Integrated Evaluation Model of Reliability Based on Varied PopulationEnvironment Data
ZHAO Yu, HUANG Min
2002, 28(5): 597-600.
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Reliability data which come from the main testing phases of product developing course were supposed to be varied population\|environment data. Based on varied population-environment data, an integrated evaluation model of reliability was established. This model used Duane model of reliability growth...
Numerical Simulation of 3D Aerospike Nozzles
DAI Wu-ye, LIU Yu, MA Bin
2002, 28(5): 601-604.
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Based on three-dimensional Reynolds averaged Navier-Stokes equations and low Reynolds number k-ε equations, a numerical program to simulate the 3D flowfield of aerospike nozzle was developed by employing two-order Non-oscillatory and Non-free-parameters Dissipative finite difference scheme. The 3D f...

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